Brake piston packing cup removing device



Dec. 1, 1942.

J. R. LINDRoll BRAKE PISTON PACKING CJUP4 REMOVING DEVICE Original Filed Jan. 23, 19159 nlfe um Patented Dec. 1, 1942 BRAKE PISTON PACKING CUP REMOVING DEVICE Joseph R. Lindmth, Gaiesbrg, nl, Original application January 23, 1939, Serial No 252,286. Divided an d this application December 26, 1940, Serial No. 371,664

1 claim. (ci. .e9- 85)V My invention relates to a device for removing the packing cups on the heads of the pistons of AB brake cylinders, the type employed on railroad freight cars, namely 'the annular cap or cup member which fits over the entire outer the piston-head and holds the packing elements in place; the invention having for its object the provision of a device whereby the snugly fitting packing cup may be easily removed without causing injury to the cup or to the piston-head.

The objects and advantages of my invention will be readily comprehended from the detailed description of the accompanying drawing where- Figure l is a top view in perspective of my imi proved device with a portion of the hand lever broken away. f

Figure 2 is a bottom view in perspective of the device with a portion of the Vhand lever broken away. Y

Figure 3'is a vertical sectional view of an air cylinder piston, (shown mounted in my improved piston dismantling apparatus disclosed in my pending application Serial No. 252,286) and my cup removing device applied thereto.

My invention is especially intended for removing the packing cup on the pressure head of the piston o an AB air brake cylinder in order to permit proper inspection, cleaning and renewal of the packing ring or member which carries the usual lubricant saturated felt ring. These packing cups are formed of thin sheet metal and provided with a beaded or curled perimeter adapted to snap into recesses in the perimeter of the piston-head after the packing elements have been put into place; the cups effecting a very snug nt about the piston-heads which make their removal rather diflicult. In order to remove these cups it has frequently been necessary to employ a tool or bar whereby the cups could be pried from the head, which often resulted in damaging the cups and the packing elements as well as the piston-head and making further use impossible. This method also consumed considerable time and labor during the frequent periodical inspections, cleaning and lubricating operations. My improved cup removing device is designed to eliminatethe diculties mentioned and to enable removal of the cups to be quickly made,

The pressure head I5 of the piston, to which the sleeve IS is secured, is recessed and flanged on its outer perimeter to receive the channeled metallic ring II, which seats on the flange I8, and to receive the curled perimeter of the metalface of J fili ` disposed toward one the non-pressure head lic cap or cup member I9 which snaps into the recess in the perimeter oi the piston head, as shown in Figure 3; one of the channels orgrooves in the ring II is provided withajlubricanti saturated'ielt ring as indicated at 2B..

It is understood, of course, that the :pistons must be completely removed fromv the cylinders to permit thorough inspection, cleaning and lubrication and suitable vmeans must be provided to completely dismantle the pistons, for example apparatus of the `nautre` shown in Figure A3, which constitutes the subject matter of my pending Aapplication Serial No. 252,286, .whereby'the piston may be properly'held in upright position by means of suitable jaw members which engage 2l of the piston;

My improved packingl cup vremoving, device consists of a substantially semiecircular member 22 provided with an inwardly disposed flange 23 which is adapted to engage in the vacant `channel or groove 24 of the' lubricator.or`channeled ring II disposed beneath the curled perimeter of the packing cup I9, as shown in Figure.- As member 22 is substantially semi-circular, it. may

be readily slid edgewisely about the packing cup I9 with its flange 23 extending into the vacant channel or groove of the double channeled ring or lubricator II, as shown in Figure 3. The member 22 is provided with the spaced apart, up-V wardly sloping arms 25, with their upper ends side of the vertical axis or center of the device and hence to one side of the axis of the piston and packing cup; the arms at top are provided with up-standing spaced apart lobes 26 to receive the end of a hand lever 21 therebetween; the hand'lever being pivotally held by a suitable pin or bolt 28.

The lever 21 its pivotal point is provided with a fulcrum or packing cup engaging means 29 pivotally secured at its upper end at 30 to the lever 21. The means 29 preferably consists of a clevis member 3l which straddles the lever and is pivotedvthereto, while the lower end is preferably provided with a threaded shank onto which a cup or socket member 32 is screwed to permit adjustment; the cup or socketed member 32 being provided with a rubber cushion or plug 33 for engagement with the outer face of the packing cup I9. 1

In order to guide the mechanism and induce the semi-circular flange 23 to properly enter the groove or channel in the lubricator ring I'I, I provide the device with a substantially semi-circular band or plate 34 which is secured to the arms 25 by means of small brackets and bolts as vat 35;`

at a short distance removed from the bolts extending loosely through arms 25 so as to permit them to ilex upwardly and the bolts are provided with small coil springs which exert a yielding downward pressure on the band or plate 34. The strip or band 34 is arranged at a slight tilt upwardly toward the open side of the device, as shown in Figure 1, to accommodate itself to the arcuate formation of the piston head and packing cup; the band 34 being arranged at a distance above the flange 23 of the member 22 commensurate with the distance between the open or vacant channel 24 in lubricating ring l1 and thev top of the cup I9. The plate or band 34 slides onto the top of the packing cup and provides a wide bearing surface on the cup and aligns the flange 23 with the groove or channel in the lubricator ring I1. The member 22 is slid completely about one-half of the piston and cup, causing the rubber cushion or plug of the fulcrum means 29 to engage with the center of the cup. The lever 21 is then -pressedV downwardly, thereby causing the flange 23 to exert upward pressure on the lubricating ring I1 located beneath or adjacent the curled edge of the packing cup and induces the curled perimeter at one side of the cup to slip out ofthe recess or groove in the piston thereby completely releasing the cup and lifting the cup and the lubricator ring l1 oi the pistonV at the same time. As previously stated, the' plate 34 is yieldirigly held in place by the loosely mounted boltssurrounded by small coil springs, with the result that the plate 34 exerts a yielding pressure on the packing cup and accommodates itself to any slight inaccuracies. The end of the lever is pivoted to one side of the vertical center of the device at a point sufiicientlyl removed from its perimeter, which ensures av gradual release of the packing cup at one side of the piston head and prevents the cup becoming damaged.

With this device removal of the cup I'I can be easily accomplished without injury to the cup or to the piston; the removal operation being performed by a single operator in a materially shorter period of time than has heretofore been the case.

The exemplication shown and described is believed to be the best embodiment of the invention, but modifications in certain details are possible and may be made without, however, departing from the spirit of my invention as defined in the appended claim.

This application refers to the divisible subject matter of my pending application Serial Number 252,286 for AB air brake piston dismantling device in keepingwith reservation made therein.

What I claim is:

A device for removing the packing cup on the pressure head of an AB air brake cylinder piston comprising a substantially semi-circular band withn inwardly disposed ilanges about its upper and lower edges, the lower ilange being adapted to edgewisely engage in an annular recess of the piston head beneath the perimeter of the packing cup, while the upper iiange is adapted to extend across the curled perimeter of the packing cup, said upper flange having upwardly and inwardly curving converging arms united atv the vertical axis or center with a central opening therethrough and having spacedV apart lobes 01T- set from the vertical center; a substantially semicircular and upwardly sloping guide plate. arranged beneath said arms and adapted to resten the packing cup; vmeans whereby said guide plate is yieldjngly supported from said arms; a hand lever pivotally mountedk at lone end between said lobes with the free end of the lever disposed toward the open side of the piston head engaging band; and anr adjustable fulcrum member, provided with a cushion element, disposed through said central opening and pivotally secured to said lever at a point removed from the pivoted end of the lever and adaptedv to engage the packing cup centrally in a vertical plane removed from'V the plane of engagement between the band flange Aand perimeter of the cup.

JOSEPH R. LINDROTH. 

